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If in an AP (a_{27}=a_8+171), what is the common difference?

Answer and explanation

Correct answer: 9

In an AP, the difference between two terms equals the difference of their positions multiplied by the common difference: \(a_{27}-a_8=(27-8)d=19d\). Given \(a_{27}-a_8=171\), we get \(19d=171\), so \(d=9\). Hence, option C is correct. If the common difference were 8, the term difference would be \(19\times8=152\), not 171. Exam tip: use \(a_m-a_n=(m-n)d\) to solve such questions quickly.

Related tags

Arithmetic ProgressionCommon DifferenceNth TermClass 10 MathematicsAlgebraic ReasoningFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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